How to access fixed arrays in internal structurs during unit testing?

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C#

Hi folks,
I have some structs with fixed arrays. I made them internal, because I want to map them to classes with properties.

I started to write some unit tests and faced the problem that I could not access the fixed arrays in my structure. There are only methods called public void Giveth_nameOfTheField();

I tried Google put did not find a solution yet. Any suggestions or hints would be appreciated.

Thx
Andy

StructLayout(LayoutKind.Sequential, CharSet = CharSet.Ansi, Pack = 1)]
internal unsafe struct FooStruct
{
    public UInt16 A;
    public UInt16 B;
    public fixed SByte Data[20];
}

internal class FooStructMapper
{
    private FooStruct m_struct = new FooStruct();

    public void PutData(byte [] data)
    {
        // Put data into m_struct
    }
  
    public UInt16 A
    {
        get { return m_struct.A; }
        set { m_struct.A = value; }
    }

    // and so on
}

Here is the test:

[TestMethod()]
[DeploymentItem("TestClient.exe")]
public void DoSomethingTest()
{
    FooStructMapper_Accessor target = new FooStructMapper_Accessor();
    object data = GetTestData(); 

    target.DoSomething(data);

    Assert.AreEqual(1, target.m_struct.A);
    Assert.AreEqual(2, target.m_struct.B);
    
    target.m_struct.Giveth_Data(); // ??? -> public void Giveth_Data();

    // expected: direct access to target.m_struct.Data
     
}

PS: Why I am doing this? I receive data from another device as byte stream. I map the byte stream to the structure to access the data fields. Then I want to make field A of the structure visible as property A of my class. Fixed arrays in the struct will be treated as "normal" arrays, too. If during a Set the new array wuld be longer than the fixed size an exception would be thrown.